[Grandpa]

While I like this idea, I don't think it would make much sense. Yes you're swinging full force, but that doesn't mean you're hitting the floor or something. The idea of an excel charge expending on hit is probably that way for a reason. Unless excel weapons are just full on copies of certain weapons from a certain demon hunting series, in which case they should be doing an entire separate damage type.

TL;DR, it's a good idea but I don't think it fits the idea of the weapon.